SIP软交换系统群呼的实现

The Implementation of Group-calling in SIP Soft-switching system

SIP(Session Initiation Protocol)是IETF提出的在IP网络上进行多媒体通信协议,它是基于文本的应用层控制协议,独立于底层协议,用于建立、维护、终结多媒体会话和呼叫。软交换作为下一代网络(NGN)的核心技术,为具有实时性要求的业务提供呼叫控制和连接控制功能。通过分析基于SIP的语音类业务应用的现状及未来的发展趋势,并对相关的主要协议和关键技术进行研究,在此基础上,提出了基于SIP的软交换系统,并实现了系统中的群呼业务功能。

SIP（Session Initiation Protocol） is a multimedia communication Protocol put forward by the IETF on IP network.It is the control Protocol of the application layer based on the text,which is independent from the underlying Protocol,being used to establish,maintain,and terminate the multimedia conversation and calls.As the core technology of the Next Generation Network（NGN）,soft-switching technology provides call and connection control for the business that calls for the instantaneity.Through analyzing the current situation and the future trend based on the application of the SIP voice service business and researching on the related major agreements and key technology,the soft-switching system based on SIP is put forward and the group-calling function has been implemented.